Question

What is the number?

• the number has 2 digits
the number is less than 10
the tenths digit is 1 more than the ones digit
the digits add up to 7

Answer 1

Explanation:

the number is then

x.y

y = x + 1

x + y = 7

using the first equation as identity in the second equation :

x + x + 1 = 7

2x = 6

x = 3

and therefore

y = x + 1 = 3 + 1 = 4

so, the number is 3.4

Answer 2

3 and 4

Explanation:

3 and 4 added up is 7,4 is one number mor than 3